The Long-Term Fertilization Trials in Halle (Saale) (2nd ed.)

The soils of our planet in enabling and sustaining plant growth provide the basis of human existence, as about 98 % of all foodstuff is primarily produced by t- restrial ecosystems. As a consequence of erosion, desertification, and the dev- opment of buildings, roads, industrial estates, etc, the utilizable soil surface area of the world is now decreasing by about 10 million ha annually, a loss which is occurring concurrently with a rapid increase of world population which is - pected to reach 8